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The Brower passes to server any cookies that are valid for a given page in HTTP header
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Note only name=value is passed because PATH DOMAIN SECURE and EXPIRES are used to check if cookie should be passed
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The server stores cookie strings in $HTTP_COOKIE environment variable as name1=value1; name2=value2;
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It is easy for CGI script to decode this $HTTP_COOKIE environment variable
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One can send cookies back to client using Set-cookie: name1=value1; expires= .. ; domain= ...; etc. before the content-type: text/html header line
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